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Yagi antenna having matching coaxial cable and driven element impedances

  • US 6,307,524 B1
  • Filed: 01/18/2000
  • Issued: 10/23/2001
  • Est. Priority Date: 01/18/2000
  • Status: Expired due to Fees
First Claim
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1. A Yagi antenna, comprising:

  • an insulative circuit board having a proximal end and a distal end;

    a J-shaped driven element having an impedance Ω

    d and being printed on a top surface of the circuit board, wherein the J-shaped driven element comprises a short portion, a long portion that is twice as long as the short portion, and a connecting portion connecting the short portion and the long portion, the short and long portions being parallel to each other, and wherein a mid-point of the long portion of the J-shaped driven element is grounded;

    one or more director elements printed on a top surface of the circuit board at a position located between the distal end of the circuit board and the J-shaped driven element;

    a reflector element printed on a bottom surface of the circuit board at a position located between the proximal end of the circuit board and the J-shaped driven element;

    a microstrip transmission line printed on the circuit board, the microstrip transmission line having a proximal end, a distal end, and an impedance Ω

    w, the distal end of the microstrip transmission line being electrically connected to the J-shaped driven element; and

    a cable having an impedance Ω

    c, the cable being electrically connected to the proximal end of the microstrip transmission line, wherein the impedance Ω

    c matches the impedances Ω

    d and Ω

    w.

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